Transverse tubules

myofibrils

this is a part of the muscle fiber that are long organelles that fill the muscle cell.
they contain tiny strands of contracile proteins called actin and myosin
they are responsible for cell contraction

sarcoplasmic reticulum

this is a part of the muscle fibers that is a system of membranes. In this, each myofibril is wrapped.
This stores calcium ions used for muscle cell contractions
they are encircled by t-tubules and carry electrical impulses.

synaptic cleft

action potential

this part of a neuron is the electrical impluse. it travels along the neruon's axon to the synaptic terminal. the synaptic terminal eleases acetylcholine into the synaptic cleft, which flows and binds to receptors on the motor end plate.
THIS is generated along the entire muscle fiber sarcolemma and into the t tubules

eccentric

fast, slow, intermediate

Fast fibers

contraction speed: very quick, but strong
Fiber size: large diameter
Fatigue resistance: fatigues quite quickly
Energy production: large reserves of glycogen that store glucose which is used for the rapid production of anerobic ATP.
phasic muscles provide movement

large diameter

fatigues quickly

anerobic ATP

slow fibers

contraction speed: very slow
fiber size: small fiber diameter and weak contraction
fatigue resistance: high resistance (can last for hours)
energy product: large amounts of myoglobin, which is a red pigment that binds oxygen to ATP for aerobic production.